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control/controlclient: delete old naclbox code, require ts2021 Noise

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Updates #11585
Updates tailscale/corp#18882

Change-Id: I90e2e4a211c58d429e2b128604614dde18986442
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2024-04-01 21:23:27 -07:00 committed by Brad Fitzpatrick
parent b9611461e5
commit 2409661a0d
3 changed files with 119 additions and 207 deletions
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169
control/controlclient/direct.go
View File

@ -83,7 +83,7 @@ type Direct struct {
dialPlan ControlDialPlanner // can be nil
mu sync.Mutex // mutex guards the following fields
serverKey key.MachinePublic // original ("legacy") nacl crypto_box-based public key
serverLegacyKey key.MachinePublic // original ("legacy") nacl crypto_box-based public key; only used for signRegisterRequest on Windows now
serverNoiseKey key.MachinePublic
sfGroup singleflight.Group[struct{}, *NoiseClient] // protects noiseClient creation.
@ -436,12 +436,6 @@ type loginOpt struct {
OldNodeKeySignature tkatype.MarshaledSignature
}
// httpClient provides a common interface for the noiseClient and
// the NaCl box http.Client.
type httpClient interface {
Do(req *http.Request) (*http.Response, error)
}
// hostInfoLocked returns a Clone of c.hostinfo and c.netinfo.
// It must only be called with c.mu held.
func (c *Direct) hostInfoLocked() *tailcfg.Hostinfo {
@ -454,7 +448,7 @@ func (c *Direct) doLogin(ctx context.Context, opt loginOpt) (mustRegen bool, new
c.mu.Lock()
persist := c.persist.AsStruct()
tryingNewKey := c.tryingNewKey
serverKey := c.serverKey
serverKey := c.serverLegacyKey
serverNoiseKey := c.serverNoiseKey
authKey, isWrapped, wrappedSig, wrappedKey := decodeWrappedAuthkey(c.authKey, c.logf)
hi := c.hostInfoLocked()
@ -494,20 +488,22 @@ func (c *Direct) doLogin(ctx context.Context, opt loginOpt) (mustRegen bool, new
c.logf("control server key from %s: ts2021=%s, legacy=%v", c.serverURL, keys.PublicKey.ShortString(), keys.LegacyPublicKey.ShortString())
c.mu.Lock()
c.serverKey = keys.LegacyPublicKey
c.serverLegacyKey = keys.LegacyPublicKey
c.serverNoiseKey = keys.PublicKey
c.mu.Unlock()
serverKey = keys.LegacyPublicKey
serverNoiseKey = keys.PublicKey
// For servers supporting the Noise transport,
// proactively shut down our TLS TCP connection.
// Proactively shut down our TLS TCP connection.
// We're not going to need it and it's nicer to the
// server.
if !serverNoiseKey.IsZero() {
c.httpc.CloseIdleConnections()
}
if serverNoiseKey.IsZero() {
return false, "", nil, errors.New("control server is too old; no noise key")
}
var oldNodeKey key.NodePublic
switch {
case opt.Logout:
@ -594,7 +590,7 @@ func (c *Direct) doLogin(ctx context.Context, opt loginOpt) (mustRegen bool, new
request.Auth.Provider = persist.Provider
request.Auth.LoginName = persist.UserProfile.LoginName
request.Auth.AuthKey = authKey
err = signRegisterRequest(&request, c.serverURL, c.serverKey, machinePrivKey.Public())
err = signRegisterRequest(&request, c.serverURL, c.serverLegacyKey, machinePrivKey.Public())
if err != nil {
// If signing failed, clear all related fields
request.SignatureType = tailcfg.SignatureNone
@ -614,21 +610,16 @@ func (c *Direct) doLogin(ctx context.Context, opt loginOpt) (mustRegen bool, new
}
// URL and httpc are protocol specific.
var url string
var httpc httpClient
if serverNoiseKey.IsZero() {
httpc = c.httpc
url = fmt.Sprintf("%s/machine/%s", c.serverURL, machinePrivKey.Public().UntypedHexString())
} else {
request.Version = tailcfg.CurrentCapabilityVersion
httpc, err = c.getNoiseClient()
httpc, err := c.getNoiseClient()
if err != nil {
return regen, opt.URL, nil, fmt.Errorf("getNoiseClient: %w", err)
}
url = fmt.Sprintf("%s/machine/register", c.serverURL)
url := fmt.Sprintf("%s/machine/register", c.serverURL)
url = strings.Replace(url, "http:", "https:", 1)
}
bodyData, err := encode(request, serverKey, serverNoiseKey, machinePrivKey)
bodyData, err := encode(request)
if err != nil {
return regen, opt.URL, nil, err
}
@ -650,7 +641,7 @@ func (c *Direct) doLogin(ctx context.Context, opt loginOpt) (mustRegen bool, new
res.StatusCode, strings.TrimSpace(string(msg)))
}
resp := tailcfg.RegisterResponse{}
if err := decode(res, &resp, serverKey, serverNoiseKey, machinePrivKey); err != nil {
if err := decode(res, &resp); err != nil {
c.logf("error decoding RegisterResponse with server key %s and machine key %s: %v", serverKey, machinePrivKey.Public(), err)
return regen, opt.URL, nil, fmt.Errorf("register request: %v", err)
}
@ -844,7 +835,6 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
c.mu.Lock()
persist := c.persist
serverURL := c.serverURL
serverKey := c.serverKey
serverNoiseKey := c.serverNoiseKey
hi := c.hostInfoLocked()
backendLogID := hi.BackendLogID
@ -858,6 +848,10 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
}
c.mu.Unlock()
if serverNoiseKey.IsZero() {
return errors.New("control server is too old; no noise key")
}
machinePrivKey, err := c.getMachinePrivKey()
if err != nil {
return fmt.Errorf("getMachinePrivKey: %w", err)
@ -914,7 +908,7 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
}
request.Compress = "zstd"
bodyData, err := encode(request, serverKey, serverNoiseKey, machinePrivKey)
bodyData, err := encode(request)
if err != nil {
vlogf("netmap: encode: %v", err)
return err
@ -926,20 +920,12 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
machinePubKey := machinePrivKey.Public()
t0 := c.clock.Now()
// Url and httpc are protocol specific.
var url string
var httpc httpClient
if serverNoiseKey.IsZero() {
httpc = c.httpc
url = fmt.Sprintf("%s/machine/%s/map", serverURL, machinePubKey.UntypedHexString())
} else {
httpc, err = c.getNoiseClient()
httpc, err := c.getNoiseClient()
if err != nil {
return fmt.Errorf("getNoiseClient: %w", err)
}
url = fmt.Sprintf("%s/machine/map", serverURL)
url := fmt.Sprintf("%s/machine/map", serverURL)
url = strings.Replace(url, "http:", "https:", 1)
}
// Create a watchdog timer that breaks the connection if we don't receive a
// MapResponse from the network at least once every two minutes. The
@ -1047,7 +1033,7 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
vlogf("netmap: read body after %v", time.Since(t0).Round(time.Millisecond))
var resp tailcfg.MapResponse
if err := c.decodeMsg(msg, &resp, machinePrivKey); err != nil {
if err := c.decodeMsg(msg, &resp); err != nil {
vlogf("netmap: decode error: %v", err)
return err
}
@ -1164,9 +1150,8 @@ func initDisplayNames(selfNode tailcfg.NodeView, resp *tailcfg.MapResponse) {
}
}
// decode JSON decodes the res.Body into v. If serverNoiseKey is not specified,
// it uses the serverKey and mkey to decode the message from the NaCl-crypto-box.
func decode(res *http.Response, v any, serverKey, serverNoiseKey key.MachinePublic, mkey key.MachinePrivate) error {
// decode JSON decodes the res.Body into v.
func decode(res *http.Response, v any) error {
defer res.Body.Close()
msg, err := io.ReadAll(io.LimitReader(res.Body, 1<<20))
if err != nil {
@ -1175,11 +1160,8 @@ func decode(res *http.Response, v any, serverKey, serverNoiseKey key.MachinePubl
if res.StatusCode != 200 {
return fmt.Errorf("%d: %v", res.StatusCode, string(msg))
}
if !serverNoiseKey.IsZero() {
return json.Unmarshal(msg, v)
}
return decodeMsg(msg, v, serverKey, mkey)
}
var (
debugMap = envknob.RegisterBool("TS_DEBUG_MAP")
@ -1189,25 +1171,8 @@ func decode(res *http.Response, v any, serverKey, serverNoiseKey key.MachinePubl
var jsonEscapedZero = []byte(`\u0000`)
// decodeMsg is responsible for uncompressing msg and unmarshaling into v.
// If c.serverNoiseKey is not specified, it uses the c.serverKey and mkey
// to first the decrypt msg from the NaCl-crypto-box.
func (c *Direct) decodeMsg(msg []byte, v any, mkey key.MachinePrivate) error {
c.mu.Lock()
serverKey := c.serverKey
serverNoiseKey := c.serverNoiseKey
c.mu.Unlock()
var decrypted []byte
if serverNoiseKey.IsZero() {
var ok bool
decrypted, ok = mkey.OpenFrom(serverKey, msg)
if !ok {
return errors.New("cannot decrypt response")
}
} else {
decrypted = msg
}
b, err := zstdframe.AppendDecode(nil, decrypted)
func (c *Direct) decodeMsg(compressedMsg []byte, v any) error {
b, err := zstdframe.AppendDecode(nil, compressedMsg)
if err != nil {
return err
}
@ -1224,26 +1189,11 @@ func (c *Direct) decodeMsg(msg []byte, v any, mkey key.MachinePrivate) error {
return fmt.Errorf("response: %v", err)
}
return nil
}
func decodeMsg(msg []byte, v any, serverKey key.MachinePublic, machinePrivKey key.MachinePrivate) error {
decrypted, ok := machinePrivKey.OpenFrom(serverKey, msg)
if !ok {
return errors.New("cannot decrypt response")
}
if bytes.Contains(decrypted, jsonEscapedZero) {
log.Printf("[unexpected] zero byte in controlclient decodeMsg into %T: %q", v, decrypted)
}
if err := json.Unmarshal(decrypted, v); err != nil {
return fmt.Errorf("response: %v", err)
}
return nil
}
// encode JSON encodes v. If serverNoiseKey is not specified, it uses the serverKey and mkey to
// seal the message into a NaCl-crypto-box.
func encode(v any, serverKey, serverNoiseKey key.MachinePublic, mkey key.MachinePrivate) ([]byte, error) {
// encode JSON encodes v as JSON, logging tailcfg.MapRequest values if
// debugMap is set.
func encode(v any) ([]byte, error) {
b, err := json.Marshal(v)
if err != nil {
return nil, err
@ -1253,11 +1203,8 @@ func encode(v any, serverKey, serverNoiseKey key.MachinePublic, mkey key.Machine
log.Printf("MapRequest: %s", b)
}
}
if !serverNoiseKey.IsZero() {
return b, nil
}
return mkey.SealTo(serverKey, b), nil
}
func loadServerPubKeys(ctx context.Context, httpc *http.Client, serverURL string) (*tailcfg.OverTLSPublicKeyResponse, error) {
keyURL := fmt.Sprintf("%v/key?v=%d", serverURL, tailcfg.CurrentCapabilityVersion)
@ -1353,7 +1300,7 @@ func (c *Direct) isUniquePingRequest(pr *tailcfg.PingRequest) bool {
func (c *Direct) answerPing(pr *tailcfg.PingRequest) {
httpc := c.httpc
useNoise := pr.URLIsNoise || pr.Types == "c2n" && c.noiseConfigured()
useNoise := pr.URLIsNoise || pr.Types == "c2n"
if useNoise {
nc, err := c.getNoiseClient()
if err != nil {
@ -1554,14 +1501,6 @@ func (c *Direct) setDNSNoise(ctx context.Context, req *tailcfg.SetDNSRequest) er
return nil
}
// noiseConfigured reports whether the client can communicate with Control
// over Noise.
func (c *Direct) noiseConfigured() bool {
c.mu.Lock()
defer c.mu.Unlock()
return !c.serverNoiseKey.IsZero()
}
// SetDNS sends the SetDNSRequest request to the control plane server,
// requesting a DNS record be created or updated.
func (c *Direct) SetDNS(ctx context.Context, req *tailcfg.SetDNSRequest) (err error) {
@ -1571,54 +1510,8 @@ func (c *Direct) SetDNS(ctx context.Context, req *tailcfg.SetDNSRequest) (err er
metricSetDNSError.Add(1)
}
}()
if c.noiseConfigured() {
return c.setDNSNoise(ctx, req)
}
c.mu.Lock()
serverKey := c.serverKey
c.mu.Unlock()
if serverKey.IsZero() {
return errors.New("zero serverKey")
}
machinePrivKey, err := c.getMachinePrivKey()
if err != nil {
return fmt.Errorf("getMachinePrivKey: %w", err)
}
if machinePrivKey.IsZero() {
return errors.New("getMachinePrivKey returned zero key")
}
// TODO(maisem): dedupe this codepath from SetDNSNoise.
var serverNoiseKey key.MachinePublic
bodyData, err := encode(req, serverKey, serverNoiseKey, machinePrivKey)
if err != nil {
return err
}
body := bytes.NewReader(bodyData)
u := fmt.Sprintf("%s/machine/%s/set-dns", c.serverURL, machinePrivKey.Public().UntypedHexString())
hreq, err := http.NewRequestWithContext(ctx, "POST", u, body)
if err != nil {
return err
}
res, err := c.httpc.Do(hreq)
if err != nil {
return err
}
defer res.Body.Close()
if res.StatusCode != 200 {
msg, _ := io.ReadAll(res.Body)
return fmt.Errorf("set-dns response: %v, %.200s", res.Status, strings.TrimSpace(string(msg)))
}
var setDNSRes tailcfg.SetDNSResponse
if err := decode(res, &setDNSRes, serverKey, serverNoiseKey, machinePrivKey); err != nil {
c.logf("error decoding SetDNSResponse with server key %s and machine key %s: %v", serverKey, machinePrivKey.Public(), err)
return fmt.Errorf("set-dns-response: %w", err)
}
return nil
}
func (c *Direct) DoNoiseRequest(req *http.Request) (*http.Response, error) {
nc, err := c.getNoiseClient()

21
tstest/integration/integration_test.go
View File

@ -562,16 +562,11 @@ func TestAddPingRequest(t *testing.T) {
func TestC2NPingRequest(t *testing.T) {
tstest.Shard(t)
tstest.Parallel(t)
env := newTestEnv(t)
n1 := newTestNode(t, env)
n1.StartDaemon()
n1.AwaitListening()
n1.MustUp()
n1.AwaitRunning()
env := newTestEnv(t)
gotPing := make(chan bool, 1)
waitPing := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
env.Control.HandleC2N = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
t.Errorf("unexpected ping method %q", r.Method)
}
@ -584,8 +579,14 @@ func TestC2NPingRequest(t *testing.T) {
t.Errorf("body error\n got: %q\nwant: %q", got, want)
}
gotPing <- true
}))
defer waitPing.Close()
})
n1 := newTestNode(t, env)
n1.StartDaemon()
n1.AwaitListening()
n1.MustUp()
n1.AwaitRunning()
nodes := env.Control.AllNodes()
if len(nodes) != 1 {
@ -604,7 +605,7 @@ func TestC2NPingRequest(t *testing.T) {
cancel()
pr := &tailcfg.PingRequest{
URL: fmt.Sprintf("%s/ping-%d", waitPing.URL, try),
URL: fmt.Sprintf("https://unused/some-c2n-path/ping-%d", try),
Log: true,
Types: "c2n",
Payload: []byte("POST /echo HTTP/1.0\r\nContent-Length: 3\r\n\r\nabc"),

108
tstest/integration/testcontrol/testcontrol.go
View File

@ -24,7 +24,8 @@
"sync"
"time"
"go4.org/mem"
"golang.org/x/net/http2"
"tailscale.com/control/controlhttp"
"tailscale.com/net/netaddr"
"tailscale.com/net/tsaddr"
"tailscale.com/tailcfg"
@ -50,6 +51,7 @@ type Server struct {
Verbose bool
DNSConfig *tailcfg.DNSConfig // nil means no DNS config
MagicDNSDomain string
HandleC2N http.Handler // if non-nil, used for /some-c2n-path/ in tests
// ExplicitBaseURL or HTTPTestServer must be set.
ExplicitBaseURL string // e.g. "http://127.0.0.1:1234" with no trailing URL
@ -82,7 +84,7 @@ type Server struct {
suppressAutoMapResponses set.Set[key.NodePublic]
noisePubKey key.MachinePublic
noisePrivKey key.ControlPrivate // not strictly needed vs. MachinePrivate, but handy to test type interactions.
noisePrivKey key.MachinePrivate
nodes map[key.NodePublic]*tailcfg.Node
users map[key.NodePublic]*tailcfg.User
@ -253,6 +255,10 @@ func (s *Server) initMux() {
})
s.mux.HandleFunc("/key", s.serveKey)
s.mux.HandleFunc("/machine/", s.serveMachine)
s.mux.HandleFunc("/ts2021", s.serveNoiseUpgrade)
if s.HandleC2N != nil {
s.mux.Handle("/some-c2n-path/", s.HandleC2N)
}
}
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@ -266,6 +272,36 @@ func (s *Server) serveUnhandled(w http.ResponseWriter, r *http.Request) {
go panic(fmt.Sprintf("testcontrol.Server received unhandled request: %s", got.Bytes()))
}
type peerMachinePublicContextKey struct{}
func (s *Server) serveNoiseUpgrade(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
if r.Method != "POST" {
http.Error(w, "POST required", 400)
return
}
s.mu.Lock()
noisePrivate := s.noisePrivKey
s.mu.Unlock()
cc, err := controlhttp.AcceptHTTP(ctx, w, r, noisePrivate, nil)
if err != nil {
log.Printf("AcceptHTTP: %v", err)
return
}
defer cc.Close()
var h2srv http2.Server
peerPub := cc.Peer()
h2srv.ServeConn(cc, &http2.ServeConnOpts{
Context: context.WithValue(ctx, peerMachinePublicContextKey{}, peerPub),
BaseConfig: &http.Server{
Handler: s.mux,
},
})
}
func (s *Server) publicKeys() (noiseKey, pubKey key.MachinePublic) {
s.mu.Lock()
defer s.mu.Unlock()
@ -273,63 +309,50 @@ func (s *Server) publicKeys() (noiseKey, pubKey key.MachinePublic) {
return s.noisePubKey, s.pubKey
}
func (s *Server) privateKey() key.ControlPrivate {
s.mu.Lock()
defer s.mu.Unlock()
s.ensureKeyPairLocked()
return s.privKey
}
func (s *Server) ensureKeyPairLocked() {
if !s.pubKey.IsZero() {
return
}
s.noisePrivKey = key.NewControl()
s.noisePrivKey = key.NewMachine()
s.noisePubKey = s.noisePrivKey.Public()
s.privKey = key.NewControl()
s.pubKey = s.privKey.Public()
}
func (s *Server) serveKey(w http.ResponseWriter, r *http.Request) {
_, legacyKey := s.publicKeys()
noiseKey, legacyKey := s.publicKeys()
if r.FormValue("v") == "" {
w.Header().Set("Content-Type", "text/plain")
io.WriteString(w, legacyKey.UntypedHexString())
return
}
w.Header().Set("Content-Type", "application/json")
// TODO(maisem/bradfitz): support noise protocol here.
json.NewEncoder(w).Encode(&tailcfg.OverTLSPublicKeyResponse{
LegacyPublicKey: legacyKey,
// PublicKey: noiseKey,
PublicKey: noiseKey,
})
}
func (s *Server) serveMachine(w http.ResponseWriter, r *http.Request) {
mkeyStr := strings.TrimPrefix(r.URL.Path, "/machine/")
rem := ""
if i := strings.IndexByte(mkeyStr, '/'); i != -1 {
rem = mkeyStr[i:]
mkeyStr = mkeyStr[:i]
}
// TODO(maisem/bradfitz): support noise protocol here.
mkey, err := key.ParseMachinePublicUntyped(mem.S(mkeyStr))
if err != nil {
http.Error(w, "bad machine key hex", 400)
return
}
if r.Method != "POST" {
http.Error(w, "POST required", 400)
return
}
ctx := r.Context()
switch rem {
case "":
s.serveRegister(w, r, mkey)
case "/map":
mkey, ok := ctx.Value(peerMachinePublicContextKey{}).(key.MachinePublic)
if !ok {
panic("no peer machine public key in context")
}
switch r.URL.Path {
case "/machine/map":
s.serveMap(w, r, mkey)
case "/machine/register":
s.serveRegister(w, r, mkey)
case "/machine/update-health":
io.Copy(io.Discard, r.Body)
w.WriteHeader(http.StatusNoContent)
default:
s.serveUnhandled(w, r)
}
@ -549,7 +572,7 @@ func (s *Server) serveRegister(w http.ResponseWriter, r *http.Request, mkey key.
}
var req tailcfg.RegisterRequest
if err := s.decode(mkey, msg, &req); err != nil {
if err := s.decode(msg, &req); err != nil {
go panic(fmt.Sprintf("serveRegister: decode: %v", err))
}
if req.Version == 0 {
@ -563,7 +586,7 @@ func (s *Server) serveRegister(w http.ResponseWriter, r *http.Request, mkey key.
log.Printf("Got %T: %s", req, j)
}
if s.RequireAuthKey != "" && req.Auth.AuthKey != s.RequireAuthKey {
res := must.Get(s.encode(mkey, false, tailcfg.RegisterResponse{
res := must.Get(s.encode(false, tailcfg.RegisterResponse{
Error: "invalid authkey",
}))
w.WriteHeader(200)
@ -637,7 +660,7 @@ func (s *Server) serveRegister(w http.ResponseWriter, r *http.Request, mkey key.
authURL = s.BaseURL() + authPath
}
res, err := s.encode(mkey, false, tailcfg.RegisterResponse{
res, err := s.encode(false, tailcfg.RegisterResponse{
User: *user,
Login: *login,
NodeKeyExpired: allExpired,
@ -729,7 +752,7 @@ func (s *Server) serveMap(w http.ResponseWriter, r *http.Request, mkey key.Machi
r.Body.Close()
req := new(tailcfg.MapRequest)
if err := s.decode(mkey, msg, req); err != nil {
if err := s.decode(msg, req); err != nil {
go panic(fmt.Sprintf("bad map request: %v", err))
}
@ -1011,7 +1034,7 @@ func (s *Server) takeRawMapMessage(nk key.NodePublic) (mapResJSON []byte, ok boo
}
func (s *Server) sendMapMsg(w http.ResponseWriter, mkey key.MachinePublic, compress bool, msg any) error {
resBytes, err := s.encode(mkey, compress, msg)
resBytes, err := s.encode(compress, msg)
if err != nil {
return err
}
@ -1034,19 +1057,14 @@ func (s *Server) sendMapMsg(w http.ResponseWriter, mkey key.MachinePublic, compr
return nil
}
func (s *Server) decode(mkey key.MachinePublic, msg []byte, v any) error {
func (s *Server) decode(msg []byte, v any) error {
if len(msg) == msgLimit {
return errors.New("encrypted message too long")
}
decrypted, ok := s.privateKey().OpenFrom(mkey, msg)
if !ok {
return errors.New("can't decrypt request")
}
return json.Unmarshal(decrypted, v)
return json.Unmarshal(msg, v)
}
func (s *Server) encode(mkey key.MachinePublic, compress bool, v any) (b []byte, err error) {
func (s *Server) encode(compress bool, v any) (b []byte, err error) {
var isBytes bool
if b, isBytes = v.([]byte); !isBytes {
b, err = json.Marshal(v)
@ -1057,7 +1075,7 @@ func (s *Server) encode(mkey key.MachinePublic, compress bool, v any) (b []byte,
if compress {
b = zstdframe.AppendEncode(nil, b, zstdframe.FastestCompression)
}
return s.privateKey().SealTo(mkey, b), nil
return b, nil
}
// filterInvalidIPv6Endpoints removes invalid IPv6 endpoints from eps,